Hammer of Nazahn

Whenever Hammer of Nazahn or another Equipment you control enters, you may attach that Equipment to target creature you control.
Equipped creature gets +2/+0 and has indestructible.
Equip {4}

Secret Lair Drop

Commander Masters

Whenever Hammer of Nazahn or another Equipment enters the battlefield under your control, you may attach that Equipment to target creature you control.
Equipped creature gets +2/+0 and has indestructible.
Equip {4}

Double Masters

Commander 2017

Because damage remains marked on a creature until the damage is removed as the turn ends, nonlethal damage dealt to the equipped creature may become lethal if you attach Hammer of Nazahn to a different creature during that turn.

If Hammer of Nazahn enters the battlefield at the same time as other Equipment you control, its ability will trigger for each of those Equipment.